SU957430A1 - Device for simulating frequency pickup signals - Google Patents

Description

The second step number counters, while the counting inputs of the first and second additional controlled dividers are combined and connected to the output of the first reference frequency generator, and their control inputs are connected to the outputs of the first storage register and the first step number, respectively, the counting inputs of the third and fourth additional controlled dividers are combined and connected to the output of the first reference frequency generator, and their control inputs are connected to the outputs of the second storage register and the second counter number a step, respectively, the inputs of the first pulse subtractor being connected to the outputs of the first and second auxiliary controlled dividers, and the inputs of the second pulse subtractor connected to the outputs of the third and fourth additional controlled dividers, the inputs of the first and second reversing counters connected with the outputs of the first and second pulse extractors, respectively, and the outputs are connected to the control inputs of the first and second main controlled dividers. Figure 1 shows the block diagram of the proposed device; Fig. 2 is a diagram for explaining the operation of the device. The device contains the first and second generators 1 and 2 of the reference frequency, a divider 3 with a fixed division factor, delay element 4, the first and second counters 5 and b of the step number, the first and second registers 7 and 8 of storage, the first, second, third and fourth additional controlled dividers 9-12, first and second pulse subtractors 13 and 14, first and second reversible counters 15 and 16, first and second main controlled dividers 17 and 18, and output switches 19 and 20. Diagram, how the device works shown in figure 2, where Rt0h min the initial digits Cheney frequencies on. the outputs of the simulated sensor; Td, :) the initial values of the periods; (p-1) and p - numbers of nodes of approximation; m - the greatest number of nodes appcfximiatsii. The device works as follows. . When the START command is sent to the generator 2 input of the reference frequency from the last output. A low reference frequency begins to arrive at the input of the divider 3 with a fixed division factor, simulating the current time during which the value of the parameter is linear. Simultaneously with the start-up command, the device nodes are reset: the dividers 3,9,10,11,12,17 and 18 are in the zero state, the counters 15 and 16 are in the state corresponding to the initial value of the frequency outputs of the simulated sensor, and The counter 15 records the code of the largest period value, which decreases during operation of the device, and the counter 16 records the code of the smallest period value, which increases during the operation of the device, the storage register 7 and the step number 5 are recorded respectively h Isla 1 and 2; the numbers in the storage register and in the counter B of the step number are written respectively to the numbers m and (m-1). During operation of the device, it is necessary to ensure a linear change in frequency on buses 19 and 20. At the same time, it is known that the period is related to the frequency by a non-linear inverse relationship, i.e. control inputs | The dividers 17 and 18 need to submit codes that are nonlinearly time varying. To clarify the process of nonlinear change of the period code, for example, in counter 15, consider the following position. The inverse relationship, the linking period and frequency, is approximated by a broken line with step D1 (Fig. 2), with the largest and smallest values of the output frequencies being chosen in magnitude that coincide with the first and last elements of the approximation. The counter 5 records the number 2, the register 7 is the number 1, and the counter 15 records the frequency code Fniox. When the RUN command is given, during the first overflow of divider 3, the number of pulses equal to, for example, 1000 is fed to the inputs of controlled divider 9, and the subtractor's input 13 is the number of pulses equal to S1000-1006 / 2) 500. If the code is taken equal to 1000 Hz, then the period code Тг 11П | Recorded in counter 15 is equal to 1000 МКС, and during the new section of approximation it will decrease to 5000 МКС . When the oscillator reference frequency 1 is 1 MHz, the initial frequency on the bus 19 of the device is equal to n, F, 9 1-10 and at the end of the first approximation segment 19 Wo 2000 Hz At the time of the first overflow, splitter 3 is a signal from its output in the register 7 and 8, codes from counters 5 and 6 are rewritten, respectively, and then the same signal, delayed in delay element 4, increases the number in counter 5 by one and decreases the number in counter b by one too. At the end of the second stretch, the frequency on bus 19 is equal to

-.one

  ° 500-166

 3000 kHz,

since the period code in counter 15 is reduced by 1000/3 / 3-1 / 166, i.e. the frequency on the device bus 19 for each approximation step of 1000 ISS duration increases by 1 kHz, or linearly in time.

In the second channel of the device, the frequency on bus 20 should also decrease linearly, therefore the perit code in counter 16 will increase nonlinearly over time due to the fact that counter 16 is enabled for summation, and counter 6 is for subtraction.

The operation of the device ends by removing the START command from the generator 2 input of the reference frequency.

The proposed device provides a linear change in the output frequency of the simulated sensor, which expands the area of its use and simplifies the construction of simulation stands. .

Claims (2)

1. Authors certificate of the USSR, № 314311, cl. H 03 K 13/26, 1971. 2. USSR author's certificate number 479248, cl. H 03 K 13/20, 1975.